Abstract
Based on existing analytical models, an improved model was developed to predict load distribution of ball screw more accurately. In this model, variation of contact angle is considered. The results of this model demonstrate that the load distribution of ball screw is not uniform and load distribution curve falls from the position near the load to further. Downward trend is more marked when the variation of contact angle is introduced into the model. The larger ratio of helical pitch to screw diameter is, the worse the nonuniformity of load distribution is. This will impair the stiffness of ball screw. It is found that the calculated results are significant to ball screw design.
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